在婚礼上，他唱了一首专门为这个场合写的歌。

At the wedding he sang a song specially written for the ___occasion.

我有一套西装，但只在特殊场合穿。

I have a suit but I only wear it on special ___occasions.

新国王的加冕礼当然是一个历史性的场合。

The coronation of a new king is, of course, a historic ___occasion.